51128490 has 32 divisors (see below), whose sum is σ = 140238720. Its totient is φ = 11686464.

The previous prime is 51128461. The next prime is 51128501. The reversal of 51128490 is 9482115.

It is a happy number.

It is a super-2 number, since 2×51128490² = 5228244979360200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121525 + ... + 121944.

It is an arithmetic number, because the mean of its divisors is an integer number (4382460).

Almost surely, 2^51128490 is an apocalyptic number.

51128490 is an abundant number, since it is smaller than the sum of its proper divisors (89110230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51128490 is a wasteful number, since it uses less digits than its factorization.

51128490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243486.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 51128490 is about 7150.4188688496. The cubic root of 51128490 is about 371.1541511337.

The spelling of 51128490 in words is "fifty-one million, one hundred twenty-eight thousand, four hundred ninety".